# MI Fires Derwent Small Wood Burning Ecodesign Stove

A compact, UK-designed wood-burning stove built to deliver efficient warmth with clean, controlled combustion. The MI Fires Small Derwent produces a practical 4.2kW heat output with 79.2% efficiency – ideal for smaller living spaces, well-insulated rooms and homeowners who want dependable wood-burning performance in a compact design.

## Why Choose This Model?

The Small Derwent is an excellent choice if you want a lower-output wood-burning stove that won’t overpower a smaller room. Its 4.2kW heat output makes it particularly well suited to compact living spaces, while its 79.2% efficiency and A energy rating help make effective use of every log. With Ecodesign compliance, DEFRA approval and external air compatibility, it combines traditional wood-burning warmth with modern heating performance.

### Key Features

-   **4.2kW heat output** – ideal for smaller living spaces and well-insulated rooms.
-   **Wood-burning design** – specifically designed for efficient burning of wood logs.
-   **Ecodesign 2022 compliant** – meets modern efficiency and emissions requirements.
-   **Smoke Control Area exempt (DEFRA approved)** – suitable for use in designated Smoke Control Areas.
-   **79.2% efficiency** – delivers dependable heat while making efficient use of fuel.
-   **A energy rating** – efficient performance for everyday home heating.
-   **Steel body with cast iron door** – durable construction designed for regular use.
-   **Airwash system** – helps keep the viewing glass clearer for a better view of the flames.
-   **External air compatible** – suitable for installations where an external air supply is required.
-   **Top or rear flue outlet** – interchangeable installation options provide added flexibility.
-   **Compact dimensions** – well suited to smaller fireplaces and living spaces.
-   **Designed in the UK** – developed with a focus on efficient combustion and low emissions.

### Technical Highlights

-   Rated heat output: 4.2kW
-   Efficiency: 79.2%
-   Energy rating: A
-   Weight: 50kg
-   NOx emissions at 13% O₂: 64mg/Nm³
-   Fuel type: Wood only
-   Construction: Steel body with cast iron door
-   Ecodesign 2022: Yes
-   DEFRA Approved: Yes
-   External air compatible: Yes
-   Flue size: 5-inch (125mm)

  

### Specifications

Guarantee

2 Years

Efficiency

79.20%

Heat Output

4.2 kW

Nox Emissions at 13% O2

64 mg/Nm3

Energy Rating

A

DEFRA Approved

Yes

Airwash System

Yes

Construction

Steel Body - Cast Door

Flue Outlet

Top & Rear (Interchangeable)

Flue Size

5-inch (125mm)

Fuel Type

Wood Only

Fuel Grate Type

Wood Burning Only

Log Length

250mm

Suitable For 12mm Hearth

Yes

External Air Compatible

Yes

Distance to Combustibles - Sides

440 mm

Distance to Combustibles - Rear

240 mm

Sweep Flue through Stove?

Yes

Colour

Black

More Colours

No

Colour Options

Blacks

Finish

Matt

### Product Sizes

![](https://cdn.shopify.com/s/files/1/1029/2396/0650/files/generic-stove-diagram_modern_1.webp?v=1787909591)

Overall Width

346 mm

Overall Height

453 mm

Overall Depth

259 mm

Rear to Centre of Top Flue (F)

100.5 mm

Width to Centre of Top Flue (E)

173 mm

Height to Centre of Rear Flue (D)

341.5 mm

Depth to Centre Flue (D)

158.5mm

Weight

50 Kg

### Installation Guide

[Click here to view installation guide.](https://cdn.shopify.com/s/files/1/1029/2396/0650/files/mi_fires_install_small_derwent.pdf?v=1788346690 "Installation Guide")

### Liner Kit (Optional)  
  

![](https://cdn.shopify.com/s/files/1/1029/2396/0650/files/LINER_KIT.png?v=1788437904)

**Liner Kit Includes**

-   10m 316-grade flue liner
-   Pot hanging cowl
-   Liner adaptor
-   500mm vitreous stove pipe
-   Register plate
-   Carbon monoxide (CO) alarm
-   Data plate

## Details

- **Price:** 541.34 GBP - 757.34 GBP
- **Vendor:** Mi Fires
- **Type:** wood stove

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| No | 541.34 GBP | In stock |
| Yes | 757.34 GBP | In stock |

## Images

- MI Fires Derwent Small Wood Burning Ecodesign Stove
- MI Fires Derwent Small Wood Burning Ecodesign Stove
- MI Fires Derwent Small Wood Burning Ecodesign Stove
- MI Fires Derwent Small Wood Burning Ecodesign Stove
- MI Fires Derwent Small Wood Burning Ecodesign Stove
- MI Fires Derwent Small Wood Burning Ecodesign Stove

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> Source: [Pro-Line Direct](https://prolinedirect.co.uk/products/derwent-small-wood-burning-ecodesign-stove)
> Updated: 2026-09-07